It's hard to figure out what is going on.
But if you want a quieter motor, you can try the 300 rpm one. You can get it less expensively directly from Hurst (IIRC it's exactly what VPI uses) but you would have to get a new, larger, pulley from VPI.
But if you want a quieter motor, you can try the 300 rpm one. You can get it less expensively directly from Hurst (IIRC it's exactly what VPI uses) but you would have to get a new, larger, pulley from VPI.